Expansion Valve and control mechanism for an expansion valve

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EP 1 092 929 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	02.01.2002 Bulletin 2002/01

(43)	Date of publication A2:
	18.04.2001 Bulletin 2001/16

(21)	Application number: 00119567.6

(22)	Date of filing: 07.09.2000

(51)	International Patent Classification (IPC)⁷: F25B 41/06, F16K 31/68

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

15.10.1999 JP 29435599

(71)	Applicant: TGK Co., Ltd.
	Tokyo 193-0942 (JP)

(72)	Inventors:
	Kawakami, Satoshi Hachioji-shi, Tokyo (JP) Sendo, Isao Hachioji-shi, Tokyo (JP) Ito, Tatsuo Hachioji-shi, Tokyo (JP) Ueno, Shigeyoshi Hachioji-shi, Tokyo (JP)

(74)	Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät
	Maximilianstrasse 58 80538 München 80538 München (DE)

(54)	Expansion Valve and control mechanism for an expansion valve

(57) In an expansion valve having a control mechanism with an airtight chamber 3, said airtight chamber 3 is sealed by a steel ball 32 joined into a filling hole 31 in a metallic wall of said airtight chamber. Said steel ball 32 is fixed by resistance welding for sealing said filling hole 31. The diameter ratio D/d between the inner diameter D of said filling hole 31 and the outer diameter d of the spherical surface of steel ball 32 is set to a value falling in a range from 0.6 to 0.85.

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